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    <title>组合选择器</title>
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        .class01 , #id01{
            color: blue;
            font-size: 20px;
            border: 1px solid yellow;
        }
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<p id="text_show">
    需求1.修改class="class01" 的div标签和id="id01"所有的span标签字体的颜色为蓝色,字体大小为20个像素,边框为1像素的黄色实线
</p>
<div id="id01">div标签为class01</div><br />
<span class="class01">span标签</span><br />
<div>div标签</div><br />
<div class="class01">div标签id01</div>

<div class="look_source_code" onclick="getPageContent()">查看源码</div>
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